turn the appveyor builds green again
turn the appveyor builds green again

...by bumping the minimum supported version.
glandium/sccache,glandium/sccache,luser/sccache2,mozilla/sccache,luser/sccache2,luser/sccache2,glandium/sccache,mozilla/sccache,glandium/sccache,mozilla/sccache,luser/sccache2